Characterization by XPS and XAS of supported Pt/TiO2-CeO2 catalysts
- 1 July 1990
- journal article
- catalysis
- Published by Wiley in Surface and Interface Analysis
- Vol. 16 (1-12) , 341-346
- https://doi.org/10.1002/sia.740160173
Abstract
TiO2 and CeO2 are will known for inducing strong metal‐support interactions J(SMSI) of a different nature when used as supports for Pt catalysts. X‐ray photoelectron spectroscopy analysis of mixtures of TiO2CeO2 oxide supports (80:20 and 20:80) reveals at the surface a remarkable stabilization of cerium in the +3 oxidation state; the stabilization is more pronounced with lower cerium oxide concentration. X‐ray absorption spectroscopy measurements done on the LIII edge show the same variation as a function of cerium oxide concentration, but in the bulk the reduction is much lower. Cerium in Pt/TiO2CeO2 catalysts exhibits the same behaviour.Keywords
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